Seasonal and Between‐Substrate Variation in Mobile Epifaunal Community in a Multispecific Seagrass Bed of Otsuchi Bay, Japan
Seasonal and Between‐Substrate Variation in Mobile Epifaunal Community in a Multispecific Seagrass Bed of Otsuchi Bay, Japan
复制标题
日本大槌湾多特异性海草床移动表层动物群落的季节和基质间变化
DOI：
10.1046/j.1439-0485.2001.01726.x
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
M. Matsumasa
中科院分区：
文献类型：
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作者：
M. Nakaoka;Tetsuhiko Toyohara;M. Matsumasa
。日本东北部大石湾的一个海草床由形态和物候不同的三种海草组成(Zstera marina、Z.cauulescens和Z.cespososa)。我们研究了海草床中的流动表层动物群落，以检验(1)表层动物群落的季节变化和基质间变化是否与海草丰度和形态复杂性的变化相一致，以及(2)表层动物群落的季节变化和基质间变化模式是否在不同的表层动物物种之间存在差异。在1995年10月至1996年11月期间，我们用一张手闭网收集了11次(每隔1个 - ，每隔1个月)从美国滨海Z.marina和美国丛枝Z.caulescens各采集一次活动的浮游动物。共采集流动附生动物9842只，归入80个分类单元。表层动物群落的丰富度和物种丰富度在夏季到秋季较高，冬季到春季较低，多样性指数和物种丰富度在滨海泽兰高于茎叶锦鸡儿。然而，这些参数的季节变化和底物间变化的模式与海草丰度和复杂性的模式不同。大多数优势种在丰度上表现出明显的季节性和底物间的变化，尽管它们的格局在个别物种之间有很大的差异。聚类分析识别出几个不同的动物群体，表现出相似的季节和底物间变化。我们的发现表明，观察到的表层动物群落的变化不是由单一或某些强烈的外部因素决定的，而是由多种因素的复杂相互作用决定的，这些因素对每个组成物种的作用不同。
. A seagrass bed in Otsuchi Bay, northeastern Japan, consists of three seagrass species (Zostera marina, Z. caulescens and Z. caespitosa) that differ in morphology and phenology. We studied the mobile epifaunal community in the seagrass bed to examine (1) whether seasonal and between-substrate variation in the epifaunal community agrees with variation in seagrass abundance and morphological complexity, and (2) whether patterns of seasonal and between-substrate variation vary among epifaunal species. We collected mobile epifauna from each of Z. marina and Z. caulescens on 11 occasions between October 1995 and November 1996 (at 1 – 1.5 month intervals) using a hand-closing net. A total of 9 842 individuals of mobile epiphytic animals were collected and they were classified into 80 taxa. Abundance and species richness of the epifaunal community were high in summer to autumn and low in winter to spring, and diversity index and evenness were higher in Z. marina than Z. caulescens. However, patterns of seasonal and between-substrate variation in these parameters did not parallel those in seagrass abundance and complexity. Most of the dominant epifaunal species showed significant seasonal and between-substrate variation in abundance, although their patterns varied greatly among individual species. A cluster analysis recognized several distinct groups of animals showing similar seasonal and between-substrate variation. Our findings suggest that the observed variation in the epifaunal community is not determined by a single or some strong external factors but by complex interactions of multiple factors operating differently for each component species.